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Every 10 seconds, a person in the United States goes to the emergency room complaining of head pain. About 1.2 million visits are for acute migraine attacks.
Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.
The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
For about 100 years, scientists thought that peptic ulcers were caused by stress, spicy food, and alcohol. Later, researchers added stomach acid to the list of causes and began treating ulcers with antacids. Now it is known that peptic ulcers are predominantly caused by Helicobacter pylori, a spiral-shaped bacterium that normally exist in the stomach.